Widely used as an antioxidant in rubber and plastics to prevent degradation caused by oxygen and ozone. Especially effective in extending the life of tires and other rubber goods by inhibiting cracking and surface deterioration. Common additive in explosives and propellants, where it acts as a stabilizer to prevent premature decomposition and reduce the risk of accidental ignition. Used in the production of dyes and pharmaceuticals as an intermediate in organic synthesis. Employed in analytical chemistry for detecting nitrates and nitrites, forming a characteristic blue color when reacted in acidic medium. Applied in some corrosion inhibitor formulations, particularly for protecting metals in fuel systems and lubricants.